Electronic Design

DVGAs Boost Basestation Performance

Forecasting higher-performance wideband radio systems, the LMH6522 quad and LMH6521 dual digital variable gain amplifiers (DVGAs) target IF sampling receivers, I/Q digital pre-distortion signal paths and wide-bandwidth direct-conversion radios used in multi-carrier GSM, TD-SCDMA, W-CDMA, and LTE basestations. They are also quite suitable for driving high-speed ADCs. The LMH6522 quad DVGA specifies an OIP3 figure of 49 dBm at 200-MHz input, 1-dB gain steps over a wide 31-dB range, and a noise figure of 8.5 dB at maximum gain. The LMH6521 dual DVGA features a OIP3 of 48.5 dBm at a 200-MHz input, channel gain/phase matching of ±0.04 dB /±0.45°, 0.5-dB gain steps over a wide 31.5-dB range, and a noise figure of 7.3 dB at maximum gain. Prices for the LMH6522 and LMH6521 are $9.85 and $6.15 each/1,000. NATIONAL SEMICONDUCTOR CORP., Santa Clara, CA. (800) 272-9959.

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